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alexgriva [62]
2 years ago
7

The atomic number of the element witch does not usually form compounds because it's outermost shell is full

Chemistry
1 answer:
Anastaziya [24]2 years ago
7 0

The atomic numbers of elements with a filled outermost shell are 2, 10, 18, etc.

What are noble gases?

Noble gases are elements on the periodic table with filled outermost shells.

With filled outermost shells, these elements are not able to react in chemical reactions ordinarily.

These elements include Helium (2), Neon (10), Argon (18), etc.

More on noble gases can be found here: brainly.com/question/11764545

#SPJ1

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What is the concentration, in millimolar, of a 1 mg/ml solution of NaCl (molecular weight = 58 Da)?
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Explanation:

Relation between molarity and molar mass is as follows.

             Molarity = \frac{mass}{\text{molar mass}} \times \frac{1000}{V (in ml)}

It is given that mass is 1 mg/ml which is also equal to 10^{-3} g.

Molecular mass = 58 Da = 58 g/mol

Volume = 1 ml

Therefore, calculate molarity as follows.

         Molarity = \frac{mass}{\text{molar mass}} \times \frac{1000}{V (in ml)}

                       = \frac{10^{-3}g}{58 g/mol} \times \frac{1000}{1 ml}  

                       = 0.0172 molar

It is known that 1 molar equals 1000 millimolar.

So,               0.0172 molar = 0.0172 molar \times \frac{1000 millimolar}{1 molar}

                                          = 17.2 millimolar

Thus, we can conclude that the concentration of given solution is 17.2 millimolar.

6 0
4 years ago
The table below shows the volume of two samples, A and B, when placed in three containers of different volumes.
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Answer: B is a gas because its volume is less than the volume of the containers.

Explanation: hope this help bye

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